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\begin{equation}
\begin{aligned}
&amp;\frac{\textrm{d}}{\textrm{d} x} (u(x) y)=u(x) q(x) \rightarrow u(x) y=\int u(x) q(x) \textrm{d} x+C,\\
&amp;\rightarrow y=\frac{\int u(x) q(x) \textrm{d} x+C}{u(x)},
\end{aligned}\tag{2.1.11}
\end{equation}
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